1、to be placed in front of the air-conditioning unit to keep sequencing the virus and keep saving lives.被放置在空调装置的前面，来进行病毒测序和拯救生命。
2、They should be placed on the inside of the windscreen to activate the sensor in the gate.它们应该被放置在挡风玻璃的内部，以激活门上的传感器。
be placed 后接介词on组成的短语。例如
Particular emphasis will beplaced on oral language training.
